1. Ator, S.A., Denver, J.M. and Hancock, T.C.: 2000, ‘Relating Shallow Ground-water Quality to Surficial Hydrogeology in the Mid-Atlantic Coastal Plain’, in: Proceedings of the National Water-Qaulity Monitoring Council Conference, 25–27 April 2002, Austin, TX, pp. 409–423.
2. Ator, S.W., Denver, J.M., Krantz, D.E., Newell, W.L. and Martucci, S.K.: in press, A Surficial Hydrogeologic Framework for the Mid-atlantic Coastal Plain, U.S. Geological Survey Professional Paper 1680, U.S. Geological Survey, Baltimore, MD.
3. Ator, S.W., Olson, A.R., Pitchford, A.M. and Denver, J.M.: 2003, ‘Application of a multipurpose unequal-probability stream survey in the mid-atlantic Coastal Plain’, J. Am. Water Resour. Assoc. 39, 873–886.
4. Bachman, L.J., Lindsey, B., Brakebill, J.W. and Powars, D.S.: 1998, Ground-water Discharge and Base-flow Nitrate Loads to Nontidal Streams, and Their Relation to a Hydrogeomorphic Classification of the Chesapeake Bay Watershed, Middle Atlantic Coast, U.S. Geological Survey Water- Resources Investigations Report 98-4059, 71 p.
5. Berelson, W.L., Caffrey, P.A. and Hamerlinck, J.D.: 2001, ‘Creating Hydrologic Unit Boundaries for Wyoming: A Semi-automated Approach’, Paper 707 in: Proceedings, 2001 ESRI International User’s Conference, San Diego, CA.